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38 Cards in this Set

  • Front
  • Back
Atoms of the same element with different numbers of neutrons
Atomic (proton) number
The number of protons in the nucleus of an atom
MAss (nucleon) number
The number of particles (protons and neutrons) in the nucleus
A positively/negatively charged atom or (covalently bonded) group of atoms (a molecular ion)
Relative isotopic mass
The mass of an atom of an isotope compared with one-twlfth of the mass of an atom of carbon-12
Relative atomic mass
(Ar) is the weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12
Relative molecular mass
(Mr) is the weighted mean mass of a molecule compared with one-twelfth of the mass of an atom of carbon-12
Relative formula mass
The weighted mean mass of a formula unit compared with one-twelfth of the mass of an atom of carbon-12
Amount of substance
The quantity whose unit is the mole. Chemists use 'amount of substance' as a means of counting atoms
Avogadro constant
(NA) the number of atoms per mole of the carbon-12 isotope (6.02 x 10^23 mol^-1)
The amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the carbon-12 isotope
Molar mass (m)
The mass per mole of a substance. The units of molar mass are g mol^-1
Empirical formula
The simplest whole-number ratio of atoms of each element present in a compound
A small group of atoms held together by covalent bonds
Molecular formula
The actual number of atoms of each element in a molecule
Molar volume
The volume per mole of a gas. The units of molar volume are dm^3 mol^-1. At room temperature and pressure, the molar volume is approximately 24.0 dm^3 mol^-1
The amount of solute, in mol, dissolved per 1 dm^3 of solution
Standard solution
A solution of known concentration. Standard solutions are normally used in titrations to determine unknown information about another substance
Any type of particle that takes place in a chemical reaction
The molar relationship between the relative quantities of substances taking part in a reaction
A species that is a proton donor
A species that is a proton acceptor
A type of base that dissolved in water forming hydroxide ions (OH-)
Any chemical compound formed from an acid when a H+ ion from the acid has been replaced by a metal ion or anohther positive ion, such as the amonium ion, NH4+
A positively charged ion
A negatively charged ion
Acid + Carbonate -->
Salt + CO2 + H2O
Acid + Base -->
Salt + Water
Acid + Alkali -->
Salt + Water
Refers to a crystalline compound containing water molecules
Refers to a substance that contains no water molecules
Water of crystallisation
Refers to water molecules that form an essential part of the crystalline structure of a compound
Oxidation Number
A measure of the number of electrons that an atom uses to bond with atoms of another element. Oxidation numbers are derived from a set of rules
The loss of electrons or an increase in oxidation number
The gain of electrons or a decrease in the oxidation number
Redox Reaction
Is a reaction in which both reduction and oxidation take place
Reducing agent
A reagent that reduces (adds electron to) another species
Oxidising agent
A reagent that oxidises (takes electrons from) another species